Pantographic attachment for sewing-machines



H. RICHTER.

PANTOGRAPHIC ATTACHMENT FOR SEWING MACHINES. APPLICATION FILEDFEH.29.1916.

1 1 97,400. Patented Sept. 5, 1915.

wuo/wtoz UNITED STATES PATENT OFFICE.

HERMANN RICHTER, OF DENVER, COLORADO.

PANTOGRAPI-IIC ATTACHMENT FOR SEWING-MACHINES.

LISWACOO.

Application filed February 29, 1916.

To all whom it may concern:

Be it known that LHERMANN RICHTER, a citizen of the United States,residing in the city and county of Denver and State of Colorado, haveinvented certain new and useful Improvements in Pantographic Attachmentsfor Sewing-Machines; and I do declare the following to be a full, clear,and eXact description of the invention, such as will enable othersskilled in the art to which it appertains to make and use the same,reference being had to the accompanying drawings, and to the charactersof reference marked thereon, which form a part of this specification.

My invention relates to improvements in means for manipulating a seriesof work holders respectively connected with a corresponding number ofsewing machines.

This attachment consists of a combination of pantographic instruments soconnected with the work holders that by the movement of the pointer orstylus over the model suitably mounted, figures or designs correspondingwith the pattern will be formed upon the cloth or other fabric carriedby the work holders of all of the sewing machines, any desired numberbeing employed. In this manner the manipulation of a single pointer orstylus, results in simultaneously producing any desired number ofdesigns corresponding with the pattern, since the number of sewingmachines connected in cooperative relation with the pantographicinstruments, may be indefinite and limited only by the power which it ispracticable to exert through the medium of the pantographicconstruction. It will be understood that the manipulation of each workholder through the medium of the combination of pantographs, requires acertain amount of manual exertion. Consequently, there is a limit to thenumber of work holders that may be practicably manipulated from a singlepointer or stylus.

My object is to provide a pantographic construction'which shall offer aminimum resistance, thus making it practicable to simultaneously actuatea maximum number of work holders mounted in cooperative relation with acorresponding number of sewing machines. The general idea ofmanipulating a series of work holders connected with a correspondingnumber of sewing machines through the medium ofa combination ofpantographic instruments, actuated Specification of Letters Patent.

Patented Sept. 5, 1916.

Serial No. 81,284.

from a single pointer or stylus as the latter is moved over the patternor design which it is desired to reproduce, is not new. Hence, my objectis to provide a novel specific construction which shall have advantagesover other constructions heretofore in vogue, which have been intendedto accomplish the same results.

The features of novelty of my improvements, result in reducing. thenumber of pivot points, and, consequently, reducing the friction orresistance offered as the pantographic instrument is manipulated for thepurpose stated.

In my improved construction of pantographic instrument, I employ twopantographic units which are suitably spaced and both of which areconnected with the series of work holders in cooperative relation, eachpantographic unit consisting of a single parallelogram only.Furthermore, in order to reduce the friction to a minimum, I employantifrictional wheeled supports for the rods or links which connect thetwo pantographo units. The reduction of the friction in aconstruction'of this kind to a minimum, is very important, since, if thefriction or resistance offered by the pantographic construction istoo'great, accuracy in the performance of the work is impossible. Forinstance, if considerable friction must be overcome when the tracingstylus is moved, the pressure or force necessary to start the movementwill be so great, that when once started the momentum of the structurewill carry the tracing stylus farther than is required or desired, thuspreventing accuracy, or, in other words, spoiling the work.

Having brieflybutlined my present improvement, I will proceed todescribe the same in detail, reference being made to the accompanyingdrawing, in which is illustrated an embodiment thereof.

In this drawing,-Figure l is a top plan View of my improved pantographicconstruction, connected in cooperative relation with work holders whichare themselves cooperatively arranged with a corresponding number ofsewing machines, six being illustrated in the drawing. Fig. 2 is asection taken through one of the wheeled anti-frictional supports forthe links or rods which connect the two pantographic units.

The same reference characters indicate the same parts in both views. 7

Let the numeral 5 designate each of two pantographic units each. ofwhich is composed of a parallelogram consisting of two parallel members6 and 7 and two other parallel members 8 and 9. The member 6 ispivotally connected with the two members 8 and 9 as shown at 10 and 12;while the member 5 is pivotally connected with the two members 8 and 9as shown at 13 and 14. The two members 8 and 9 are each provided with anumber of perforations 15 for purposes of adjustment, since adjustmentof the anto-graphic units is necessary in order to determine the scaleof the work as compared with that of the pattern. One advantage of aconstruction of this character is, that the pattern may be comparativelylarge, while the design produced onthe work carried by each holder, maybe as small as is necessary or desirable.

Themember 60f each pantographic unitis provided with an extension16beyond' the pivot 10, the extremity of said extension being pivotallyconnected as shown at 17 with a stationary part 18. The pivots 17 arethe only stationary parts of the entire pantographic structure. Each ofthe members 9 is provided with a rigid part 19 which ex tends from thepivot 12, at right angles'to the part 9 whereby the parts 9' and 19 formsubstantially a bell' crank lever. The extremities of the parts 19remote from the pivots 12, are pivotally connected as shown at 20 withthe opposite extremities of a flat rod or link 21 whichis-supportedintermediate its extremities by two anti-frictional supports 22 each ofwhich consists of-avertically disposed threaded stem 23 which passesthrough an opening 24 formed inthe rod 21 and connected with the latterby means of nuts 25 and 26respectively screwed against the rod onopposite sides. The lower extremity of the stem 23 is" formed integralwith a plate 26, while a similar plate 27 is threaded upon the stem 23and held in the desired position of adjustment by a lock nut 28 The twoparts 26 and 27 are arranged on opposite sides of a" small platform 29from which the said plates are spaced by bearing balls 30. The platform29 is equipped with downwardly projecting lugs or ears 31 which areconnected with the spindle 32 of a wheel or roller 33. By virtue of thisconstruction the roller-carrying platform 29, will change its positionto correspond with the direction of travel, as circumstances may requireand with a minimum of friction which is'very important-in an instrumentof this character, as heretofore described.

The member 9 of one of the pantographic units 5, being the one fartherto the right in Fig. 1 of the drawing, is provided with an extension 34which carries a stylus 35 which extends downwardly whereby it is adaptedto be moved over the pattern or design 36 to be reproduced, this patternbeing formed upon a piece of material 37 which is fastened by means ofthumb tacks 38 or any other suitable fastening devices, upon the tableor other suitable support 39 upon which the pantographic constructionand the sewing machine heads 40 are mounted.

The two members 6 of the pantographic units, are pivotally connectedasshown at 41- intermediate their extremities with the oppositeends of arod 42 which is supported intermediate its extremities with wheeledsupports'22.- The pivots 13 of the two pantographic units, connect theseunits respectively with the extremities of arod 43, the latter'beingmounted on a wheeled support 22 located intermediate its extremities.Thisrod 43 is also connected in operative relation as shown at 44 withthe work holders 45 of all of the sewing machines 40, six

operate in unison through themedium of gear wheels 46 which are mountedrespectively on the shafts or spindles 47 of the several machines andconnected by means of a chain 48' with a suitable motor (not shown).

The-work upon which the design or pattern 36 ist'o b'e-reproduced, isdesignated in each case'by the numeral49 and the same is connected ineach case with a work holder 45 which is'' The needles of the severalsewing machines and which are to reproduce the design or patternin theform of embroidery, are arran-ge'd to pass through the portions 50 ofthe work inclosed by the'rings 51 of the several workholders 45.

Assuming that the pantographic construction is mounted on the table 39and cone nected with the work holders-of the sewing machines in themanner heretofore described, the operator in order to reproduce thedesign 36, grasps a knob 52-with which the free extremity of thestylus-carrying ex tension- 34 is equipped, and moves this extension inthe manner required in order to trace the design 36 which is to bereproduced by the sewing machines on the work 49, as heretoforeexplained. By virtue of the well-known principle of the operation ofpantographs,-the design 36 will be reproduced on a suitably reduced"scale, on the several pieces of work 49.- Hence, the principle ofoperation need not be explainedin detail as it is'well understood, thenovel feature of my improvement being the specific pantographicconstruction disclosed, whereby the friction or resistance incident toits operation is reduced to a minimum.

Having thus described my invention, what I claim is,-

1. A pantographic attachment for sewing of ordinary construction.

machines consisting in combination with work holders adapted to berespectively associated with the machines, two parallelograms, onemember of each parallelogram having a rigid extension forming an anglewith the said member, a link connecting the said extensions, a secondlink connecting two of the corresponding members of the twoparallelograms, and a third link connecting the two parallelograms withthe several work holders.

2. A pantographic attachment for sewing machines consisting incombination with work holders adapted to be respectively associated withthe machines, two parallelorams, one member of each parallelogram avinga rigid extension forming an angle with the said member, a linkconnecting the said extensions, a second link connecting two of thecorresponding members of the two parallelograms, a third link connectingthe two parallelograms with the several work holders, andanti-frictional supports for the said links.

In testimony whereof I alfix my signature, in presence of two witnesses.

HERMANN RICHTER. Witnesses A. EBERT OBRmN, A. J. OBRIEN.

Copies of this patent may be obtained for five cents each, by addressingthe "Commissioner of Iatents, Washington, D. 0."

